Linux TCP connection errors/limit?

Recently, our mailserver has started showing an increasing number of messages like these in /var/log/messages:

Feb 9 19:05:08 marshall kernel: KERNEL: assertion ((1<<sk2->state)&(TCPF_ESTABLISHED|TCPF_CLOSE_WAIT|TCPF_CLOSE)) failed at af_inet.c(692)
Feb 9 19:05:12 marshall kernel: KERNEL: assertion (newsk->state != TCP_SYN_RECV) failed at tcp.c(2229)


We are assuming that this is also related to an increasing number of tcp connection errors:

/bin/netstat -s | grep "failed connection attempts"
5241 failed connection attempts

This is the number since a reboot around 16 hours ago.

Third perhaps related behavior: Postfix has been crapping out several times a day. It's running, but telnet to port 25 and it just hangs. A 'service postfix restart' sets it back on track for a few hours.

This is redhat 7.2 running 2.4.20.


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